Door locking mechanism for banks and the like



y 5, 1932- s. l. MERRILL ET AL 1,865,779

DOOR LOCKING MECHANISM FOR BANKS AND THE LIKE Filed Dec. 18. 1929 2 Sheets-Sheet 1 July 5, 1932- s. l. MERRILL ET AL DOOR LOCKING MECHANISM FOR BANKS AND THE LIKE Filed Dec. 18. 1929 2 Sheets-Sheet 2 F166. 5 r I we m I12 us IX J M' #5 [1% [III liiiiilllldlll 5 Sq 1g i 4353 33 5? gg-4 ---T--' I J V l I 4 55 f %/4ZHIIY 5 L 2! 7 1 I Q FICA. .4

:2 w as u INVENTORS S I. MERRILL w'. o. MERRILL ATTORNEYS Patented July 5, 1932 UNIT ST T S PATENT 1 OFFICE SAII'IUEL I. MERRILL, OF LOS ANGELES, AND-WALLACE D; MERRILL, OF SIERRA .MYADRIEZ,

CALIFORNIA I noon LOCKING MECHANISM 50R BANKsAND THE LIKE Application file d' De cember is, 192a. Serial No. 415,068.

Our invention relates to an improved automatic door-locking mechanism."

An object of the invention is the provision of a door-locking mechanism automatically operable from a remote point; withthe result that the device is of utility as a protective apparatus for use in banks and similar Y establishments, as an aid in the capture of persons endeavoring to rob the bank.

Another object is the provision of a doorlocking mechanism'as described, which, in its broadest aspect, is applicable to doors of any type, but which, in its preferred embodiment, is ing doors.

Another object is the provision of a doorlocking mechanism as describedfwhieh is automatically operable from a number of stations remote from the door or doors,for example, within each of the several tellers cages; with the'result that'any one ofseveral persons who may happen to observe a'robber in the attempt to rob the bank, may actuate the locking mechanism in such a manner as to positively lock all theexits fromthe'bank,

and thus prevent the robbers escape.

Another ObJGCt 1s the PI'OVlSlOIl' of alockmg mechanlsm as described, 1n whlch the means for releasing the locking means is separate from the mechanism whereby the locking means is moved to locking positionfor example, the switch wher'eby'the locking means 'is released, may be accessible only within the oflice of one ofthe oflicials of the bank, whereas a switch whereby the locking means is moved to locking position, may be situated in each of the tellers cages. By

positioning the releasing switch in such'a manner that it is not accessible to any one of the tellers, makes it impossible for the robber to enforce any one of the tellers to release the locking means; with the result that even if the robber is successful'in enforcing one or more of the tellers to relinquish money or valuables to him, the robber can not possibly'efiect hisescape from" the bank. Another objectis the provisionofa doorlocking mechanism which is applicable to a plurality of doors, so as. to simultaneously particularly applicable to revolvdoors.

p A further object is the provision of an automatic door locking mechanism having all the above described advantages, which is of .an exceedingly simple nature, and hence,

which is relatively inexpensive to manufacture, install, and operate. Positiveness of operation is one of the primary objects which 'is attainedby utilizing the mechanism of the present invention.

Another object is to provide a signal light on each of the tellers cages, and at other advantageous positions, as well as the appropriate mechanism and electrical connections necessary to illuminate the lights whenever the door locking mechanism is moved to 'locking position. By means of these signal lights, the tellers and other employees of the bank will be warned of the presence of an emergency requlrlng lmm'edlate action.

The invention possesses other objects and advantageous features, some of which, with those enumerated, will be set forth in thefollowing description of the inventions particular embodiment which is illustrated in the drawings accompanying and forming a part h of the specification.

Referring to the drawings: 7

Figure 1 is a schematic view showing the floor plan of a bank in which the locking mechanism of the present invention has been installed. Portions of the figure are broken away to better disclose the nature of the invention.

Fig. 2 is a vertical sectional view taken upon the line 2-20f F 1, and showing the locking mechanism in front elevation.

Fig. 3 is an enlarged, detail, vertical sectional view showing the structure of one of the switches whereby the locking mechanism is energized. The plane of section may be ,7

considered as having been taken upon theline it 3-3 of Fig. v1, with the direction of View as "indicated.

- Fig. 4,- is a rear elevational view oftherevolvingdoors shown upon Fig. 1, andthe locking mechanism associated therw'ith, portions of the figure being broken away and shown in section to better disclose the nature of the invention.

Fig. 5 is an enlarged, vertical sectional view showing a portion of the electrical control apparatus for the locking mechanism. The plane of section is taken upon the line 5-5 of Fig. 1, with the direction of view as indicated by the arrows.

Fig. 6 is a diagram of the electrical connections associated with the locking mechanism and the signal system.

Fi 7 is an enlarged detail view of the switdh whereby the operation of the signal system is controlled. The plane of section be considered to have been taken upon the line 7'7 of Fig. 1, with the direction of view as indicated.

Whereas the locking mechanism of the present invention is capable of modification so as to adapt it to operation in conjunction with doors of various types, the modification herein shown and described, is particularly designed for use in connection with thewell known revolving doors. A pair of such doors are indicated at 11 and 12, each of these doors comprising a central shaft 13 extending vertically between upper and lower sills 14 and 16 respectively, the shafts 13 being journalled in the sills for free rotation about vertical axes. A plurality, preferably four panels 17, radiate from each of the shafts 13, these panels being equally spaced in respect to their angular displacement from each other. Each of the doors 11 and 12 is revoluble within a passageway 18 and 19 respectively, the walls 21 of which are arcuate and so spaced that the associated door 11 or 12 may revolve therein with the edges of the panels 17 passing closely adjacent the walls 21. If it be desired to permit the doors 11 and 12 to be rotated in but a single direction, suitable ratchet means 22 may be associated with each door. Each door 11 and 12 carries an annular flange 23, which isdisposed coaxially with, and preferably upon the top of the associated door, extending upwards therefrom. A recess 24 is provided either in the upper sill 14 or within a suitable structure 26 rigid therewith adjacent one side of the flange 23. Thewall 26 of the recess, which is opposite the proximal portion ofthe flange 23, is preferably arcuate, but about a center displaced from the axis of rotation of the associated door, the parts being so arranged that the wall 26 diverges from the surface of tho flange 23 in the direction of the doors rotation. A roller 27 is interposed between each wall 26 and the associated flange 23, and a suitable spring 28 is continually urgin the roller 27 toward the narrower end of t e recess 24. As a result, any attempt to rotate the associated door in the wrong direction, will cause the roller 27 to be wedged into the narrower end of the recess 24, and prevent such reverse rotation; Whereas rotation of the door in the proper direction, will tend to move the roller 27 toward the larger end of the recess 24, where it is not capable of offering any resistance to the rotation of the door.

Each of the doors ll and 12, is provided with a suitable stationary track 31, which may conveniently serve as the upper sill 14, or which may be rigidly attached thereto. Furthermore, the tracks 31 of the several doors, may be continuous, and united into a single track, as shown. A slot 32 is provided in the upper surface of the track 31 for each of the doors 11 and 12, these slots 32 extending longitudinally of the track and radially with respect to the axes of rotation of the doors. A transverse slot 33 is formed in the under side of each of the tracks 31, at such a distance from the point at which the upper end of the associated shaft 13 is journalled, that the associated flange 23 is received within the transverse slot 33, which is preferably arcuate so as to establish a better fit between the flange 23 and the track 31; This fit however, is sufiiciently loose to permit free rotation of the flange 23 and associated door. Both the slots 32 and 33 are of such depth that they intersect each other; and each of the flanges 23 is of such height that its upper edge passes through the bottom of the associated slot 32. Furthermore, each of the flanges 23 is provided with a plurality of notches 34 in the upper edge thereof, the number of notches 34 corresponding with the number of panels 17 in that door. These notches are so positioned in their respective flanges 23, that when one of the notches 34 is in register with the associated longitudinal slot 32, two opposite panels 17 of that door are positioned sufiiciently close to the walls 21 of the passage 18, to prevent a person entering or leaving the foyer 36 of the bank; and the other two panels 17 are clear of the walls 21, the clearance being sufiicient to prevent the liability of anyones becoming entrapped between twoadj acent panels 17, as will readily be understood. The doors are shown in this position upon Figs. 1 and 2.

The locking detents constituting a portion of the locking mechanism of the present invention, are each in. the form of a disc 41 associated with each door 11 and 12, each of the discs 41 being disposed partially within the associated longitudinally extending slot 32. The discs 41 are adapted to be reciprocated to and from looking position by means of connecting rods 42 and 43. The rod 43 joins the two discs 41 which are journalled thereupon for free rotation in respect thereto, through the expedient of suitable pins 44; whereas the connecting rod 42 is connected at one end to the pin 44 of one of the discs 41, and at theother end to a crank pin 46 disposedv eccentrically upon, a crank disc 47,

which in turn is carried at one end of a shaft 48. This shaft 48 is journalled in a suitable framework 49, and is connected to an electric motor 51 through a suitable reduction gearing 52, in such a manner that energization of the motor 51 results in rotating the shaft 48 at suitable speed. It is obvious that the nature of the connection between the shaft 48 and the several detent discs 41, is such that the detents are reciprocated from one extreme to the other of their movement, and back again for each complete revolution of the shaft 48. The parts are so proportioned and arranged that when the discs 41 are at one extreme of movementsay for example, in their extreme left hand position as viewed upon Figs. 1 and 2, a portion of each disc 41 is disposed within the intersection of the two associated slots 32 and 33 and within one of the notches 34 of the associated flange 23, if the associated door is in such position that one of its notches 34 is in register with the slot 32. However, if the door has not been turned to this position, the disc 41 will rest upon the top of the flange 23 in such position that as soon as the door is turned to bring one of the notches 34 into register with the associated longitudinal slot 32, the disc 41 will drop into that slot, thereby securely locking the door against further rotation. In order to preclude the possibility of the doors being rotated at such speed that the disc 41 jumps over the notch 34 without dropping thereinto, those portions 53 of the upper edfl'e of each flange 23, which immediately prece e the notches 34 during rotation of the door, are relieved, so that the disc 41 will start to drop before the notch 34 actually comes into register with the slot 32; with the result that when the notch does come into register therewith, the lower edge of the disc 41 will strike the shoulder 54 defining the after side of the notch 33, and thus prevent continued rotation of the door, whereupon the disc 41 will drop further into the notch 33 and securely lock the door against movement in either direction.

Inasmuch however, as it may be desirable to lock certain doors and leave others of the doors unlocked, we have provided the mechanism indicated in its entirety at 56, whereby it is possible to lock the door12 and leave the door 11 unlocked. Instead of being pivoted directly to the connecting rod 43, the pin 44 carrying the detent disc 41 associated with the door 12, is movable within a slot 57 extending longitudinally of the connecting rod 43 adjacent the outer end thereof. The

position of this pin 44 within the slot 57, is determined by means of a reciprocating link 58 and lever 59, the lever 59 being pivotedas by a pin 61 to the connecting rod 43 and carrying a pin 62 intermediate its ends, which is reciprocable within a slot 63 in that end 64 of the link 58 opposite the end to which the pin 44 is attached. The .parts are so proportionedand arranged that when the lever 59 is swung downwards and to the left from the position shown upon Fig. 4, until it is in parallelism with the connecting rod 43, the

pin 62 will engage the extreme left hand end of the slot 63, causing the link 58 to be pushed to its extreme left hand position, in which the pin 44 is at the extreme left hand end of its to its extreme left hand position in respect to the connecting rod 43; with the result that when the connecting rod 43 has been reciprocated as far as possible to the left, i. e., to unlocking position, the disc 41 included as a' Fig. 4, causing the pin 62 to move toward the opposite end of the slot 63 which the pin 62 engages before the lever 59 has assumed vertical position. Consequently, continued movement of the lever 59 in this direction,

will cause the link 58 to be pulled toward the right, pulling the pin 44 toward the right within its slot 57, and carrying with it the associated disc 41, so that this, disc 41 is moved into registrattion with the associated transverse slot 33 in the under side of the track 31, without the necessity of moving any of the other locking discs 41. Consequently, the associated door 12 may be securely locked, leaving the other door 13 unlocked, and without the necessity of energizing the motor 51 and its associated mechanism.

The means for raising the lever 59, ar preferably in the form of an arm 66 pivoted to the upper sill 14 in such a manner that when it is swung upwards about its pivot pin 67, it engages the under side of a pin 68 rigid with, and extending laterally from the'lever 59 adjacent its outer end. A suitable length of line or cable 69 is attached adjacent the outer end of the arm 66, and extends upwards through an eye 71 or its equivalent, supported v by the structure of the building, and thence downwards so that its other end 72 is accessible to a person standing upon the floor of the foyer 36. Consequently, by pulling downwards upon the end 7 2 of the line 69, the arm 66 may be swung upwards to carry with it the lever 59, and thus move the associated disc 41 into locking position. .Upon release of the line69, the arm 66 drops to initial position, but the arm 59 remains in looking po sition as a result of the fact that it has been moved beyond the vertical. It is not possible therefore, to move the individual locking mechanism 56 to unlocking position without reciprocating the link 43 to and from the position in which the other door or doors are projection, extends rigidly upward from the ,slot 57, carrying the associated detent disc 41 "75 upper face of the track 31, in such position that it engages the pivot pin 44 whereby the disc 41 is connected to the link 58 when the pin 44 starts to move further toward the right, as viewed upon Fig. 4, from that position in which the associated disc 41 is in register with the associated slot 33. Consequently, when the connecting rod 43 is moved toward locking position, with the individual locking mechanism 56 already set in locking position, further movement of this pin 44 toward the right, is prevented because of its engagement with the stationary pin 7 3, which results in pulling the link 58 and lever 59 toward the left as viewed upon Fig. 4, with respect to the connecting rod 43, allowing the lever 59 to drop into horizontal position; with the result that when the connecting rod 43 again moves toward the left as viewed upon this figure, it carries with it the individual locking mechanism 56 to unlocking position.

Means are provided preferably at a plurality of stations throughout the bank or other structure within which our protective apparatus has. been installed for energizing the motor 51, long enough to move the detent discs 41 into locking position; and separate means are provided at another station, preferably within the office 74 of one of the officials of the bank for energizing the motor 51 long enough to withdraw the detents 41 from locking position, means also being provided for deenergizing the motor upon completion of the movement of the connecting rods 42 and 43in either direction. As a result, after any one of the plurality of motor energizing means has been actuated, withdrawal of the locking means from locking position can not be effected until actuation of the motor energizing means which is so disposed that the tellers do not have access thereto. The motor 51 receives its energy from a suitable source of electrical energy such as a storage battery 76. It should be pointed out that we prefer to use an individual source of energy instead of connecting the motor 51 to any source of supply outside the building, for the reason that by so doing we have made it impossible for anyone whocontemplates robbing the bank, to sever the electrical connections to the bank beforehand, and thus render the protective apparatus inoperative. However, in order to make sure that the battery 76 is at all times fully charged, and'hence capable of operating the motor 51, we prefer to employ any suitable charging means such as a trickle charger indicated diagrammatically at 77, this trickle charger 77 receiving its energy from suit-able conductors 78 connected preferably with city current. Under such an arrangement the battery 76 will be fully charged and ready to operate the motor 51, even though the source of current energizing the conductors 78, has been interfered with over a period of several hours.

The motor 51 is connected to one terminal of the battery 76 by conductors 79 and 81,

and to the other terminal of the battery 7 6:

by a conductor 82 which leads to a doublepole switch 83 which in turn is connected to said other terminal of the battery 76 by a conductor 84, thus completing the circuit of the motor 51 whenthe switch 83 establishes connection between the conductors 82 and 84.

The switch 83 includes a stationary contact plate 86 to which the conductor 82 is connected, and a pair of pivotally mounted switch arms 87 and 88. These arms are pref-" erably constructed of suitable non-conductive material such as fibre, and each carries a length of conducting wire 89 and 91, respectively. The arms 87 and 88 are also provided with contact pins 92 and 93 respectively, which extend therethrough adjacent the outer or free ends of the arms 87 and 88, in such position that they rest upon and make electrical contact with the stationary contact plate 86 when the arms are swung downwards to their extreme lowermost position. The conductor wires 89 and 91 are electrically connected to the pins 92 and 93 respectively, and both conductor wires 89 and 91 are electrically connected to the conductor 84, so that the motor 51 is energized whenever either of the switch arms 87 or 88 is swung downwards far enough to permit its contact pin 92 or 93 respectively, to engage the stationary contact plate 86.

The conductor arms 87 and 88 are in such position that they extend over and adjacent the shaft 48, by the rotation of which reciprocation of the locking mechanism is effected;

and a pair of cams 96 or 97 are rigidly mounted upon the shaft 48 in such position that they are adapted to engage the switch arms 87 and 88 respectively. These cams 96 and 97 are positioned diametrically opposite each other, upon the shaft 48, and are so arranged that each engages and lifts its associated switch arm 87 or 88, as the case may be, upon completion of one-half a revolution of the shaft 48 after that switch arm 87 or 88, as

the case may be, has dropped to bring its" contact pin 92 or 98 respectively, into electrical' contact with the stationary contact plate 86. In other words, after the switch arm 87 has dropped so as to bring its contact pin 92 into engagement with the con-- tact plate 86, completing the circuit whereby the motor 51 is energized, the energization of the motor 51 will continue until the shaft 48 has been rotated to substantially one-half a complete revolution, whereupon the cam 96 will engage the under side of the switch arm 87 and raise it, moving the contact pin 92 out of engagement with the fixed contact 86, and deenergizing the motor, whereupon further rotation of the shaft 48 is prevented.

The cam 96 is so arranged upon the shaft 48 in respectto the crank pin 46, that it raises arran ed that it'raises its associated switch arm 88 when the locking mechanismhas been moved into its other extreme of movement, i. e., into unlocking position.

Fingers 98 and 99 extend rigidly from the outer ends of the switch arms 87 and 88 respectively, in position to engage the upper endsof detents 101 and 102 respectively. These detents are resiliently, mounted upon the framework 49 in such position that they are continually urged toward their respective switch arms 87 and 88, so that in normal position they lie within the paths of the fingers 98 and 99 respectively. However, these detents 101 and 102 are composed of suitable magnetic material, and serve as armatures for electromagnets 103 and 104 respectively,

which are so positioned that when these magnets are energized, their respective armatures, or detents, are withdrawn from the paths of movement of the fingers 98 and 99, aswill readily be understood.

The electromagnet 103 is adapted to be en ergized preferably from the same source 7 6.

of electrical energy, as that whereby the motor 51 is energized. Consequently, we prefer to connect the electromagnet 103 to one pole of the battery 76, by a conductor 106.v

The electromagnet 103 is connected to the other pole of the battery, by means of conductors 107 and 108, between which preferably'a plurality of switches 1'11, 112, and 113 are connected in parallel witheach other, and in series with the battery 76 and electromagnet 103. Consequently, closing of any one or more of the switches 111, 112, or 113, will result in completing the circuit of the electromagnet 103, to withdraw the armature 101 from the path of the finger 98, permitting the switch arm 87 to drop. Each of the switches 111. 112, and 113. is mounted in some convenient location, such as below the shelf 114 within a tellers cage 116. Preferably, each of the switches is of such design that it may easily and rigidly be operated by the tellers foot. For this purpose each switch comprises a pivotally mounted plate 117 electrically connected to the conductor" 107, and carrying a contact arm 118. A stationary contact 119 is electrically connected to the conductor 108. and is positioned so as to be engaged by the switch arm 118 when the foot plate 117 is depressed. By constructing the ch in this manner, it is made possible for a to close the circuit between the conductors 107 and108, and thereby energize the electromagnet-103 without having to move his hands or any portion of his body visible through the tellers window; with the result that he is enabled to cause the locking mechan'ism to be moved tolocking position without having to inform a person standingoutside thetellers cage, that he has made such a movement. V

l Thejother electromagnet 104 is connected to one terminal of the battery 7 6, by a conduo-tor 121, and to the other terminal by conductors 122 and 123. A masterswit'ch 124 isinterposed between the conductors 122 and 123,- and this switch is positioned at some. station inaccessible to the tellers, or to anyone within the foyer 36. A preferable location for the master switch 124, is within an oflice 74 of one of the officials, preferablywithin a suitable switch-box 126 mounted in the wall 127 of thatoflice. a Thus it may be understood that when the master switch 124 is closed, the electromagnet 104 will be energized to withdraw the armature 102 from the path of the finger 99, thereby permitting theswitch arm 88 to fall. This will result inpermitting the contact pin 93 to fall upon the stationary contact plate 86, completing.thecircuit whereby the motor 51 is energized so as 'to withdraw the detent discs 41 from locking position.

U ider certain circumstances, it may be desirable to employ the locking mechanism not only in the case of emergency, but also as the means whereby the doors are locked at all times except during business hours. Consequently, a second master switch 128 may be shunted across the conductors 12 and 123 in parallel with the switch124, but accessible from the outside of the building. For this purpose a switch-box 129. may be mounted in the outside wall 130 of the building, and provided with a door 131 which may be opened only by authorized persons. I

VVehave incorporated with the locking mechanism, a signalling system whereby the tellers and/or other persons may be informed that any one of the switches 111, 112, or 113, has been'closed. Consequently, this signal ling system is capable of giving a general warning that an emergency exists, requiring immediate action. The signalling means are preferably in the form of a signal light 136 disposed within each of the tellers cages 116, and other signallights located in appropriate positionssuch for example, as a signal light 137 located within the officials oflice 74. Preferably each of the lights 136 and 137, is provided with a shield or hood 138, 139 respectively, precluding the possibility of anyone within the foyer 36, seeing any. of these lights when theyare illuminated, but permitting the tellers or anyone within the oiiice 74, to observe the lights immediately upon energization thereof. All .of the lights 136 and 137 are connected to one poleof the battery 76, preferably through the same conductor 108- as that conveying current to the switches 111, 112, and 113., These lights .136 and 137 are connected to the other pole of the battery 76, through a conductor 141 which has a switch 142 interposed therein. This switch 142 is mounted upon the framework 49 adjacent the shaft 48, and includes a pair of contacts 143 and 144 mechanically joined but electrically insulated from each other by means of a block 146 of insulation. The lower contact 144 is constructed of suitable resilient material and is extended as at 147 so as to be engaged by a cam 148 carried by the shaft 48 and moved upwards to establish electrical connection with the contact 143 when the cam 148 occupies the position indicated upon Fig. 7. The parts are so proportioned and arranged that the cam 148 occupies this position when the locking mechanism has been moved so as to dispose the detent discs 41 in registration with their respective transverse slots 34, i. e., in locking position.

Furthermore We desire to employ a system of annunciators whereby each teller and the" person or persons in the ofiice 74, may be informed which of the several switches 111, 112, or 113, has been closed. For this'purpose an annunciator 151 is located in each of the tellers cages, and another annunciator 152 is located in the office 74. Each of the switches 111, 112, and 113, has another switch 153, 154, 156 respectively, coupled thereto by any suitable mechanical means indicated diagrammatically by a link 157 whereby closing one of the switches 111, 112, or 113, will also efiect closing of the accompanying switch 153, 154, or 156 respectively. Each of these second switches 153, 154, 156, receives energy from the storage batteries by means of a con ductor 158, and is connected into the associated annunciator 151 by means of a conductor 159. All the annunciators 151 and 152, are interconnected by a cable 161 having the necessary conductors insulated from each other to energize the appropriate indicating hand 162 or its equivalent, in each of the annunciators 151 and 152, to indicate which one of the switches 153, 154, or 156, has been closed. 7 7

As explained hereinabove, when any one of the switches 111, 112, or 113 is closed, the aceompanying switch 153, 154, or 156 respectively, is also closed; and the electrical connections are such that an indicating hand 162 of each of the annunciators 151 and 152, will be energized so as to indicate in each of the tellers cages and'in the ofice 7 4, which of the tellers has caused the locking mechanism to be moved into locking position.

Operation 101;'and its cam '96 is turned so that immediately upon withdrawal of the armature 101 from the path of the finger 98, the switch arm 87 will drop into switch-closing position. The other switch arm 88 is supported just out of switch-closing position by its cam 97.

Should any emergency arise, requiring that all the exits to the foyer 36 be immediately locked closed, any one of the tellers or other persons having access to one of the actuating switches 111, 112, or 113, may close his switch; with the result that the electromagnet 103 is energized. As stated hereinabove, this closing of the switch may be effected without necessarily informing a person intended to rob the bank, that the locking mechanism has been actuated. Energization of the electromagnet 103 will cause the armature 101 to be withdrawn from the path of the finger 98, thus permitting the switch arm 87 to drop to switch-closing position, whereupon the motor 51 is energized, the shaft 48 started in rotation, and all the locking detents 41 moved to locking position. Rotation of the shaft 48 will continue until it has completed substantially one-half a complete revolution, at which time the cam 96 will engage the bottom of the switch arm 87, and lift it so as to break the circuit of the motor 51, causing the mechanism to come to a stop with the locking detents 41 resting in locking position. Consequently, when any one of the doors 11 or 12 is rotated, subsequent to this movement of the locking mechanism, the detent disc 41 associated with that door, will drop into the first notch 33 which comes into register therewith; with the result that entrance from the foyer 36 through that door, is positively prevented. Iowever, as explained hereinabove, the door is locked in such position that anyone entering the foyer 36 through the door at the time that the disc 41 drops into locking position,

'will not be entrapped between two adjacent panels 17.

Atthe same time that the cam 96 engages the bottom of the switch arm 87 to lift the arm 87 and break the circuit of the motor 51 so as to leave the locking mechanism in locking position, the cam 148 will cause the resilient switch arm 144 to make electrical connection with the switch arm 143. This will effect illumination of all the signal lamps 136 and 137, so that all the tellers and any persons in the oilice 74, will be informed not only that a situation has arisen requiring that certain steps be taken immediatelysuch for example, as setting into operation a burglar alarm for the purpose of calling the police, but they will also be informed that the locking mechamsm has operated satisfactorily, and that all the exits from the foyer 36, are securely locked so as to prevent the possibility of any ones escaping therefrom.

Thus it may be seen that all persons within the foyer 36, are securely locked inside the bank; with the result that the robber can not possibly escape. The possibility of his having any of the tellers to release the locking mechanism, is precluded by the fact that the master switch 124 is inaccessible to anyone not having access to the oflicials room 7 4. herefore, the robber can not escape until the authorities have been notified, and they have arrived to place him in custody,whereupon an authorized person may close the master switch 124, resulting in energization of the electromagnet 104. This will withdraw the armature 1-02 from the path of the finger 98, whereupon the shaft 48 will again be rotated to withdraw the locking mechanism and again permit free rotation of the doors.

The rotation of the shaft 48 will continue untilthe shaft has again completed one-half a complete revolution with the result that the locking detents 41 will at that time, have been completely withdrawn from locking position. At this time, the cam 97 will engage the under side of the switch arm 88, and raise it so as to break contact with the stationary contact plate 66, thus deenergizing the motor 51 and permitting the locking detents 41 to remain at rest in unlocking position. It should be explained that the length of the armatures 101 and 109-, and the effective size of the cams 96 and 97, are such that each of the cams is en abledto lift its associated switch arms 87 and 88, high enough to permit the fingers 98 and 99 to spring'over the upper ends of the armatures 101 and 102 respectively; with the result that after the cams 96 and 97 move out of engagement withtheir respective switch arms 87 and 88, they are not permitted to again drop into switch-closing position until the appropriate switch has been closed.

It is to be understood that the details of the invention as herein disclosed, are subject to alteration within the spirit or scope of the appended claims.

We claim:

1. In a locking mechanism for a revolving door, a stationary track, an annular flange carried by said door coaXially therewith, an edge of said flange being movably disposed Within a transverse slot in one side of said track, a disc movable within a longitudinal slot in the opposite side'of said track, said slots intersecting each other and said flange having a notch therein, and means for rolling said disc within said longitudinal slot. op tionally'into or out of the intersection of the two slots.

2. In a locking mechanism for a revolving door, a stationary track, an annular flange secured to the top" of said doorcoaXially therewith, an edge of said flange being movably disposed within a transverse slot in the bottom of said track, a disc movable within a longitudinal slot in the top of said track, said slots iritersectingeach other and said flange having a notch in the upper edge thereof, and meansfor rolling said disc with in said longitudinal slot optionally into or out of the intersection of the two slots.

3. In a locking mechanism for a revolving door, a stationary track, an annular flange secured to the top of said door coaxially therewith, an edge of said flange being movably disposed within a transverse slot in the bottom of said track, a 'disc movable within a longitudinal slot in the top of said track, said slots intersecting each other and said flange having a notch in the upper edge thereof, and means for rolling said disc within said longitudinal slot optionally. into or out of the intersection of the two slots and a floating member connecting said disc to its rolling means whereby the disc is'permitted to drop by gravity into said notch when the notch comes into register vwith the longitudinal slot. I

'4. In a locking m chanism for a plurality of revolving doors, a stationary track. extending annular flange carried by each door and arranged coaxially thereupon, an edge of each flange being movably disposed within a transverse slot in one side of the associated track a disc associated with each dooryand movably disposed within alongitudina-l slot in the opposite side of the associated track,

both slots of each track intersecting each.

other and each flange having a notch therein in position to pass through the intersection of the associated slots when the associated door is moved, means for simultaneously rolling all of said discs optionally into or out of said intersections, and means for operating certain of said discs without operating the rest of said discs.

5. A door-locking device comprising a revolubly mounted shaft and an electric motor coupled thereto, a locking detent for said doorreciprocable to and from locking position, a connecting rod connected to said detent and eccentrically connected to said shaft, an energizing circuit associated with said motor, a pair of switches interposed in said circuit, said switches being connected in parallel with each other and in serieswith said motor, means operative from a remote point for closing one of said switches, means operative from another point for closing the other of said switches, and means for auto matically opening each of said switches upon completionof half a revolution of the shaft after-closing of. that switch.

6. A door-locking device comprising a revolubly mounted shaft and an electric motor coupled thereto, a locking detent for said door reciprocable to and from looking position, a connecting rod connected to said 'de-- tent and eccentrically connected to saidshaft, an energizing circuit associated with said motor, a pair of switches interposed in said circuit, said switches being connected in radially of each of said doors, an'

parallel with each other and in series with said motor, means operative from a remote point for closing one of said switches, means operative from another point for closing the other of said switches, and means for automatically opening each of said switches upon completion of half a revolution of the shaft after closing of that switch, the opening means associated with each of said switches being oppositely disposed upon said shaft with respect to the other opening means whereby each operates to stop rotation of the shaft when the shaft is displaced half a revolution from the position in which it is stopped by operation of the other opening means.

7. A door-locking mechanism comprising a revolubly mounted shaft and an electric motor operatively coupled thereto, a locking detent for said door reciprccahie to and from looking position, means coupling said detent to said shaft for reciprocating the detent to and from locking position each time the shaft is turned through a completerevolution, a source of electrical energy, a circuit electrii cally connecting said motor to said source of energy, a pair of switc es interposed in said circuit in series with said motor and in parallelism with each'other, said switches including a stationary contactand a pair of contact arms pivotally mounted at one end and adapted to rest adjacent the other end upon said stationary contact, an electromagnet associated with each of said switches, an armature associated with each electromagnet,

' spring means urging each of said armatures away from its associated elec'tromagnet and into the path of the associated switch arm to hold the arm elevated from the stationary contact, and means for individually energizing said electromagnets.

8. A door-locking mechanism comprising a revolubly mounted shaft and an electric motor operatively coupled thereto, a locking detent for said door reciprocable to and from locking position, means coupling said detent to said sa t for reciprocating the detent to and from locking position each time the shaft is turned through a complete revolu tion, a source of electrical energy, a circuit electrically connecting said motor to said source of energy, a pair of switches interposed in said circuit in series with said motor and in parallelism with each other, said switches including a stationary contact and a pair of contact'arms pivotally mounted at one end and adapted to rest adjacent the other end upon said stationary contact, an electromagnet associated with each of said switches, an armature associated with each electromagnet, spring means urging each of said armatures away from its associated electromagnet and into the path of the associated switch arm to hold the arm elevated from the stationary contact, means for individually energizing said electromagnets,

and means for elevating each of said switch arms off said stationary contact and onto the associated armature.

9. A door-locking mechanism comprising a revolubly mounted shaft and an electric motor operatively coupled thereto, a locking detent for said door reciprocable to and from locking position, means coupling said detent to said shaft for reciprocating the detent to and from looking position each time the shaft is turned through a complete revolution, a source of electrical energy, a circuit electrically connecting said motor to said source of energy, a pair of switches interposed in said circuit in series with said motor and in parallelism with each other, said switches including a stationary contact and a pair of contact arms pivotally mounted at one end and adapted to rest adjacent the other end upon said stationary contact, an electromagnet associated with each of said switches, an armature associated with each electromagnet, spring means urging each of said armatures away from its associated electromagnet and into the path of the associated switch arm to hold the arm elevated from the stationary contact, means for individually energizing said electromagnets, and means for elevating each of said switch arms off said stationary contact and onto the associated armature, each of said elevating means being operative upon completion of half a revolution of said shaft after withdrawal of the armature associated with that elevating means.

10. A door-locking mechanism comprising a revolubly mounted shaft and an electric motor operatively coupled thereto, a locking detent for said door reciprocable to and from, locking position, means coupling said detent to said shaft for reciprocating the detent to and from locking position each time the shaft is turned through a complete revolution, a source of electrical energy, a circuit electrically connecting said motor to said source of energy, a pair of switches interposed in said circuit in series with said motor and in parallelism with each other, said switches including a stationary contact and a pair of contact arms pivotally mounted at one end and adapted to rest adjacent the other end upon said stationary contact, an electromagnet associated with each of said switches, an armature associated with each electromagnet, spring means urging each of said arma tures away from its associated electromagnet and into the path of the associated switch arm to hold the arm elevated from the stationary contact, means for individually energizing said electromagnets, and a pair of cams disposed upon opposite sides of said shaft, each of said cams being disposed below one of said switch arms and engageable therewith upon half a revolution of the shaft after release of the associated switch arm.

11. A locking mechanism for a revolving door, comprising an annular flange secured coaxially to said door and having a notch therein, a stationary track arranged adjacent said flange, a roller guided on said track,

4 and means operable for moving said roller onto sa1d flange, said roller-moving meansdoor, comprising an annular flange secured coaxially to said door and having a notch therein, a stationary track arranged adjacent said flange, a roller guided on said track, means operable from a remote point for moving said roller onto said flange, said rollermoving means being pivoted to permit said annular means in the path of said projection. In testimony whereof we have signed our names to this specification. V

' SAMUEL I. MERRILL.

WALLACE D. MERRILL.

roller to drop into said notch when the door rotates to bring the notch into registry with said track, and means operable from a certain point only for moving said roller out of said path.

13. A locking mechanism for a revolving door, comprising annular means arranged coaxially upon said door and having a notch therein, a detent movable radially with respect to said annular'means, means holding said detent against moving circumferentially with respect to said annular means, and flexible means for moving said detent .onto said annular means, said detent being adapted to move into said notch when the door rotates to bring the notch into registry therewith.

14. A locking mechanism for a revolving door, comprising annular means arranged coaxially upon said door, a projection from said annular means rigid with said door, a

detent movable radially with respect to said annular means, means holding said detent against moving circumferentially with respect to said annular means, and flexible means for moving said detent onto said annular means in the path of said projection.

15. A locking mechanism for a revolving door, comprising annular means arranged coaxially upon said door and having a notch therein, a detent movable perpendicularly with respect to the path of said notch, means holding said detent against moving circumferentially with respect to said annular means, and flexible means for moving said detent onto said annular means, said detent being adapted to move into said notch when the door rotates to bring the notch into registry therewith.

16. A locking mechanism for a revolving door, comprlsing annular means arranged coaxially upon said door, a projection from said annular means rigid with said door, a detent movable perpendicularly with respect to the path of said notch, means holding said detent against moving circumferentially with respect to said annular means, and flex- .ible means for moving said detent onto said 

